Statistics - Sample Size and Example

How is sample size related to statistical tests and outcomes? Give a specific example. Why is it important to plan the sample size before collecting data?

Solution Preview

Sample size determines the accuracy and the reliability of the statistical tests and the outcomes. The larger the sample size, the better it will be for the statisticians to predict the trend and making more reliable assumptions.
For example: predicting an average weight of the males in history class. If we only take ...